max_char_width removed

The setting max_char_width has been removed, because it is unnecessary. threshold is limited to 100th of a percent percision, so it will always be met eventually (and will be met in a reasonable width for most inputs). If the user would like to tweak the max_width, they can do so by changing the threshold.

Documentation has been changed to reflect this change, and tests are passing under 2.5, 2.6, 1.7

NOTE: I will not be adhering to change=updated version number until after the design is finalized
fixed typo